refactor(admin): split academy page.tsx into colocated components

Split 1257-LOC client page into _types.ts plus nine components under
_components/ (TabNavigation/StatCard/FilterBar in shared, CourseCard,
EnrollmentCard, CertificatesTab, EnrollmentEditModal, CourseEditModal,
SettingsTab, and PageSections for header actions and empty states).
Behavior preserved exactly; page.tsx is now a thin wiring shell.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

admin-compliance/app/sdk/academy/_components/shared.tsx

@@ -0,0 +1,168 @@
+'use client'
+
+import React from 'react'
+import {
+  CourseCategory,
+  EnrollmentStatus,
+  COURSE_CATEGORY_INFO,
+  ENROLLMENT_STATUS_INFO
+} from '@/lib/sdk/academy/types'
+import { Tab, TabId } from '../_types'
+
+// =============================================================================
+// TAB NAVIGATION
+// =============================================================================
+
+export function TabNavigation({
+  tabs,
+  activeTab,
+  onTabChange
+}: {
+  tabs: Tab[]
+  activeTab: TabId
+  onTabChange: (tab: TabId) => void
+}) {
+  return (
+    <div className="border-b border-gray-200">
+      <nav className="flex gap-1 -mb-px" aria-label="Tabs">
+        {tabs.map(tab => (
+          <button
+            key={tab.id}
+            onClick={() => onTabChange(tab.id)}
+            className={`
+              px-4 py-3 text-sm font-medium border-b-2 transition-colors
+              ${activeTab === tab.id
+                ? 'border-purple-600 text-purple-600'
+                : 'border-transparent text-gray-500 hover:text-gray-700 hover:border-gray-300'
+              }
+            `}
+          >
+            <span className="flex items-center gap-2">
+              {tab.label}
+              {tab.count !== undefined && tab.count > 0 && (
+                <span className={`
+                  px-2 py-0.5 text-xs rounded-full
+                  ${tab.countColor || 'bg-gray-100 text-gray-600'}
+                `}>
+                  {tab.count}
+                </span>
+              )}
+            </span>
+          </button>
+        ))}
+      </nav>
+    </div>
+  )
+}
+
+// =============================================================================
+// STAT CARD
+// =============================================================================
+
+export function StatCard({
+  label,
+  value,
+  color = 'gray',
+  icon,
+  trend
+}: {
+  label: string
+  value: number | string
+  color?: 'gray' | 'blue' | 'yellow' | 'red' | 'green' | 'purple'
+  icon?: React.ReactNode
+  trend?: { value: number; label: string }
+}) {
+  const colorClasses = {
+    gray: 'border-gray-200 text-gray-900',
+    blue: 'border-blue-200 text-blue-600',
+    yellow: 'border-yellow-200 text-yellow-600',
+    red: 'border-red-200 text-red-600',
+    green: 'border-green-200 text-green-600',
+    purple: 'border-purple-200 text-purple-600'
+  }
+
+  return (
+    <div className={`bg-white rounded-xl border ${colorClasses[color]} p-6`}>
+      <div className="flex items-start justify-between">
+        <div>
+          <div className={`text-sm ${color === 'gray' ? 'text-gray-500' : `text-${color}-600`}`}>
+            {label}
+          </div>
+          <div className={`text-3xl font-bold mt-1 ${colorClasses[color].split(' ')[1]}`}>
+            {value}
+          </div>
+          {trend && (
+            <div className={`text-xs mt-1 ${trend.value >= 0 ? 'text-green-600' : 'text-red-600'}`}>
+              {trend.value >= 0 ? '+' : ''}{trend.value} {trend.label}
+            </div>
+          )}
+        </div>
+        {icon && (
+          <div className={`w-10 h-10 rounded-lg flex items-center justify-center bg-${color}-50`}>
+            {icon}
+          </div>
+        )}
+      </div>
+    </div>
+  )
+}
+
+// =============================================================================
+// FILTER BAR
+// =============================================================================
+
+export function FilterBar({
+  selectedCategory,
+  selectedStatus,
+  onCategoryChange,
+  onStatusChange,
+  onClear
+}: {
+  selectedCategory: CourseCategory | 'all'
+  selectedStatus: EnrollmentStatus | 'all'
+  onCategoryChange: (category: CourseCategory | 'all') => void
+  onStatusChange: (status: EnrollmentStatus | 'all') => void
+  onClear: () => void
+}) {
+  const hasFilters = selectedCategory !== 'all' || selectedStatus !== 'all'
+
+  return (
+    <div className="flex items-center gap-4 flex-wrap">
+      <span className="text-sm text-gray-500">Filter:</span>
+
+      {/* Category Filter */}
+      <select
+        value={selectedCategory}
+        onChange={(e) => onCategoryChange(e.target.value as CourseCategory | 'all')}
+        className="px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 focus:border-purple-500"
+      >
+        <option value="all">Alle Kategorien</option>
+        {Object.entries(COURSE_CATEGORY_INFO).map(([cat, info]) => (
+          <option key={cat} value={cat}>{info.label}</option>
+        ))}
+      </select>
+
+      {/* Enrollment Status Filter */}
+      <select
+        value={selectedStatus}
+        onChange={(e) => onStatusChange(e.target.value as EnrollmentStatus | 'all')}
+        className="px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 focus:border-purple-500"
+      >
+        <option value="all">Alle Status</option>
+        {Object.entries(ENROLLMENT_STATUS_INFO).map(([status, info]) => (
+          <option key={status} value={status}>{info.label}</option>
+        ))}
+      </select>
+
+      {/* Clear Filters */}
+      {hasFilters && (
+        <button
+          onClick={onClear}
+          className="px-3 py-1.5 text-sm text-gray-500 hover:text-gray-700 hover:bg-gray-100 rounded-lg transition-colors"
+        >
+          Filter zuruecksetzen
+        </button>
+      )}
+    </div>
+  )
+}